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Visual Search and Decision Making in Bees: Time, Speed, and Accuracy International Journal of Comparative Psychology, 2006, 19 , 342-357. Copyright 2006 by the International Society for Comparative Psychology Visual Search and Decision Making in Bees: Time, Speed, and Accuracy Peter Skorupski University of London, United Kingdom Johannes Spaethe University of Vienna, Austria Lars Chittka University of London, United Kingdom An insect searching a meadow for flowers may detect several flowers from different species per sec- ond, so the task of choosing the right flowers rapidly is not trivial. Here we apply concepts from the field of visual search in human experimental psychology to the task a bee faces in searching a meadow for familiar flowers, and avoiding ‘‘distraction’’ by unknown or unrewarding flowers. Our approach highlights the importance of visual information processing for understanding the behavioral ecology of foraging. Intensity of illuminating light, target contrast with background (both chromatic and achromatic), and number of distractors are all shown to have a direct influence on decision times in behavioral choice experiments. To a considerable extent, the observed search behavior can be ex- plained by the temporal and spatial properties of neuronal circuits underlying visual object detection. Our results also emphasize the importance of the time dimension in decision making. During visual search in humans, improved accuracy in solving discrimination tasks comes at a cost in response time, but the vast majority of studies on decision making in animals have focused on choice accuracy, not speed. We show that in behavioral choice experiments in bees, there is a tight link between the two. We demonstrate both between-individual and within- individual speed-accuracy tradeoffs, whereby bees exhibit considerable behavioral flexibility in solving visual search tasks. Motivation is an important factor in selection of behavioral strategies for a search task, and sensory discrimination capabilities may be underestimated by studies that quantify accuracy of behavioral choice but neglect the temporal dimension. To someone studying social insects, vertebrate behavior is sometimes sur- prisingly dull. Among the social insects, such as termites, ants, bees and wasps, we find agriculture, slavery, territorial wars, castes, division of labor, consensus build- ing, a symbolic language, and teeming cities with fantastic architecture (Frisch, 1967; Hölldobler & Wilson, 1990; Seeley, 1995). The cognitive capacities of so- cial insects are likewise impressive. Bees, in particular, have recently revealed a number of abilities traditionally only attributed to a few higher vertebrates (e.g. pigeons, dolphins, primates), such as sequence learning, object categorization, concept formation, and a simple form of counting (Chittka & Geiger, 1995; Col- lett, Fry, & Wehner, 1993; Giurfa, 2003; Menzel, 2001; Srinivasan, Zhang, & Rolfe, 1993). All of this, of course, was in place millions of years before humans graced the planet. This is all the more remarkable given that a bee’s nervous sys- tem contains less than a million neurons (Giurfa, 2003), or only 0.001% of the number of neurons that the human brain possesses. Correspondence concerning this article should be addressed to Lars Chittka, School of Biological Sciences, Queen Mary College, University of London, Mile End Road, London E1 4NS, United Kingdom ([email protected]). - 343 - Occasionally, however, research on another interesting animal, Homo sapiens , has produced concepts that are useful in their application to social insects. The psychology of visual search is one such case (Desimone, 1998). Interestingly, the typical tests run by psychologists seem more appropriate to a bee's world than to a human's. Commonly, subjects are asked to search a display for one or several defined targets (such as a small yellow square). The targets may either move across the screen from the periphery, or may appear at certain locations in the center of the screen, and they are commonly mixed with other stimuli (distractors), which differ from those the subject is asked to search for (Downing & Pinker, 1985; Zen- ger & Fahle, 1997). Targets may differ from distractors in one stimulus dimension only (such as color), or they may differ in several dimensions (such as color and shape). Performance of subjects is evaluated in terms of reaction time and accu- racy, and in terms of the individual strategy used to optimize the speed-accuracy tradeoff (Treismann & Gormican, 1988; Wolfe, 1999). Note the similarity with an insect searching a meadow for familiar reward- ing floral signals. Bees need to identify flower species with high pollen and nectar rewards and short handling times, and use sensory cues (flower scents and colors, patterns, size, plane of symmetry etc.) to memorize these flowers (Benard, Stach, & Giurfa, 2006; Chittka, Thomson, & Waser, 1999; Gould, 1985). The market can be complex – bees will typically have to choose between several dozen flower spe- cies which all differ in reward and signal, and they may encounter several flowers with different signals per second of flight (Chittka et al., 1999). To maximize fit- ness, bees need to harvest as much pollen and nectar in as little time as possible. Avoiding errors (e.g. visits to non-rewarding flowers) is only critical if the invest- ments into increased accuracy are offset by overall gains in rewards harvested per unit time. Here we review the sensory and cognitive factors that affect decision speed in foraging bees, and their interplay with accuracy. Our particular emphasis is on speed, however, since most studies in the field, to date, have focused on the accuracy with which bees perform foraging tasks (Chittka, Dyer, Bock, & Dorn- haus, 2003). In the natural lives of bees, however, speed of choice may often be of more important than accuracy. We draw on concepts from one of the most dy- namic fields of experimental psychology, visual search. Target Size, Illumination, and Visual Constraints on Search Time Before we can explore how search strategies may reflect underlying cogni- tive factors in decision making, we need to consider the visual world of a bee. De- tecting a familiar target, such as a flower of particular size, color and shape de- pends on the bee’s visual system. How conspicuous is that flower to the bee? How do distance and illumination conditions affect detectability? In fact, flowers scat- tered in a green meadow present a bee with a considerable signal-to-noise problem (Chittka, Shmida, Troje, & Menzel, 1994). The resolution of the compound eyes of bees is about 100 times worse than ours. Bee eyes are composed of several thousand functional units, the om- matidia, each of which contains its own lens and set of photoreceptors (Jander & Jander, 2002). In honeybees, for example, the resolving power of the ommatidial array is approximately 1° (Land, 1999). However, from the perspective of object detection and recognition, the spatial resolution of bee vision is not only limited by - 344 - the interommatidial angle, but also by subsequent processing. This is because the visual angle subtended by an object would presumably be required to cover more than a single ommatidium for object recognition. For example, for a target such as a 1 cm flower, to subtend a visual angle of 5°, a honeybee would have to view it from a distance of 11.5 cm (Giurfa & Lehrer, 2001). This implies that from the point of view of a bee in flight that was searching a meadow, target flowers would simply not be recognizable panoramically from a distance, and any search strategy used would necessitate relatively close approaches to potential targets. In accor- dance with this, search time for artificial flowers in a flight arena increases dra- matically as flower diameter is decreased from 28 to 5 mm (Figure 1) (Spaethe, Tautz, & Chittka, 2001). 180 160 140 120 100 80 60 Search time (s) 40 20 0 28 22 15 8 5 Flower diameter (mm) Figure 1 . Floral search times of bumblebees increase as flower diameter decreases. One bumblebee at a time was allowed to enter a flight arena and search for the artificial white flowers. For each stimulus size three flowers of equal size were arranged in an equilateral triangle with a side length of 30 cm at random position in a flight arena. Search time (±SE; N = 7) was measured between bees’ departure from the first flower until landing on the second one. For color properties of the flower and contrast to the background, see Spaethe et al. (2001). For any receptor-based visual system, the signal-to-noise ratio improves with in- creasing light intensity (Kelber, Balkenius, & Warrant, 2002; Laughlin, 1981, 1989; Theobald, Greiner, Wcislo, & Warrant, 2006). Since bees forage under illu- mination conditions that can vary by several orders of magnitude, we asked whether this is a significant factor in determining search times for flowers of vari- ous sizes, and over a realistic range of intensities. We trained bumblebees ( Bombus terrestris ) to forage from circular artificial flowers of three sizes in a flight arena in a controlled illumination laboratory, (Figure 2; for methods see Spaethe et al., 2001). The intensity was controlled by placing ARRI gel filters over the arena (Dyer & Chittka, 2004a; we tested the bees’ efficiency in finding flowers at 1,400, 700, 175 and 88 lux. For comparison, direct sunlight can be over 100,000 lux, 1,000 lux is the natural light intensity on a dull day, 500 lux is a recommended of- - 345 - fice lighting intensity, whereas intensities of around 100 lux might be expected after sunset or in understory vegetation, or under thick cloud cover (Williamson & Cummins, 1983; Kemp, 2002). Thus, we cover the intensity range at the lower end of intensity levels under which bumblebees might typically forage. 40 35 30 25 20 15 10 Search time (s) 5 0 0 200 400 600 800 1000 1200 1400 1600 Intensity (lux) Figure 2 . Search time for small, but not large, flowers depends on illumination intensity.
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